Earth System Prediction Capability ESPC 1 Earth System Prediction Capability (ESPC) Daniel P....

Earth System Prediction Capability ESPC 1

Earth System Prediction Capability (ESPC)

Daniel P. Eleuterio, Ph.D.

Jessie C. Carman, Ph.D.


ESPC Overview

Introduction• ESPC is an interagency collaboration (DoD, NOAA, DoE, NASA, NSF) to coordinate R2O for

an extended range earth system analysis and prediction capability at the weather to climate interface.

• Common prediction requirements and forecast model standards enable agencies to improve leverage and collaboration.

• Cooperative five-year demonstration projects inform S&T and R&D efforts.• Integrate of atmosphere-ocean-land-ice and space predictions into a fully coupled global

prediction capability.

Sources of Predictability:• Improve Model Physics through:

• Coupled global modeling• Improved resolution & parameterization

• Improve Initial Value Problem through • Joint observational retrievals• New hybrid DA approaches

• Increase Forecast Information through• Stochastic prediction and post-model

processing• National Multi-model ensembles• Seamless prediction

• Increase System Resolution affordably through• Efficient Computational Architectures• Efficient Numerics/Discretization


ESPC FocusESPC Focus

Assessment of Intraseasonal to Interannual Climate Prediction and Predictability, 2010, THE NATIONAL ACADEMIES PRESS • 500 Fifth Street, N.W. • Washington, DC 20001

Sources of Extended Range Predictability: Subseasonal, Intraseasonal and Interannual (ISI) Timescales


Global Coupled Models

•Global air-sea coupled models were first implemented for climate applications but are increasingly being used at subseasonal to ISI timescales.

•Benefit is seen especially in the tropics in both atmospheric and oceanic verification with largely comparable skill in extra-tropics and some benefit still seen at higher latitudes from coupling in the Southern Hemisphere.

•At week two and beyond, coupling produces skill improvements comparable to doubling resolution in some research cases.

Crown copyright Met Office


Recent ESPC Activity

Demonstrations Workshop 13-15 Nov 2012• Attended by Demo team leads, working group participants, Agency/lab representatives (for

coordination)• Organized around Demo groups: Preliminary talks, breakouts for working group discussions,

reconvened/summarized• Drafted implementation plans that are in refinement now for a July 2013 start

0-100 day Pilot Project included in ESPC Project Office focus Jan 2013• NOAA/ESRL initiative to improve R2O transitions• Overlaps ESPC time scale• Benefits from greater interagency inclusiveness• Demo Projects provide focused improvements to extended-range capability, but do not,

themselves, provide a forecast capability• NOAA OAR working on infrastructure shortfalls, working cross-agency on science funding

shortfalls


ESPC Demonstrations (10 days to 1-2 years)

• Extreme Weather Events: Predictability of Blocking Events and Related High Impact Weather at Leads of 1-6 Weeks (Stan Benjamin, ESRL)

• Seasonal Tropical Cyclone Threat: Predictability of Tropical Cyclone Likelihood, Mean Track, and Intensity from Weekly to Seasonal Timescales (Melinda Peng, NRL MRY)

• Arctic Sea Ice Extent and Seasonal Ice Free Dates: Predictability from Weekly to Seasonal Timescales (Phil Jones, LANL)

• Coastal Seas: Predictability of Circulation, Hypoxia, and Harmful Algal Blooms at Lead Times of 1-6 Weeks (Gregg Jacobs, NRL SSC)

• Open Ocean: Predictability of the Atlantic Meridional Overturning Circulation (AMOC) from Monthly to Decadal Timescales for Improved Weather and Climate Forecasts (Jim Richman, NRL SSC)


ESPC Demonstration #1 – Improved guidance for extreme weather events related to atmospheric blocking flow (flooding, drought, persistent anomalously cold/warm conditions).Objective:• Apply current understanding of the blocking process to develop, assess utility of model diagnostics to current state and forecast.Thrusts:• Diagnose longer-term weather anomalies from atmospheric blocking(quasi-stationary events with duration of at least 4 days to 2+ months)• Predict seasonal statistics (below/normal/above average conditions) at various lead times up to six months. • Predict individual events (onset/persistence/cessation)• Predict outcomes (floods, droughts, fires, extreme temps, snow). Challenges:• Several possible causes are postulated each with unique sources of predictability and technical approach. These include MJO interaction, TCs/extratropical transition, SSW events, and early season snow cover or melting.

Extreme Weather Events: Predictability of BlockingEvents and Related High Impact Weather

at Lead Times of 1-6 Weeks


Extratropical wave interactionMJO life cycle

Other tropical processes/ENSOTrop storms, extratrop transitions

Sudden stratospheric warming eventsSnow/ice cover anomalies

Soil moisture anomalies

Initial value – data assim

High-res Δx

Coupled ocean

Stochastic physics

PV cons. Numerics

Chem/aerosol

Soil/snow LSM accuracy

Processes related to blocking: onset, maintenance, cessation

Components needed

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Impact of Divergent Outflow Pattern on Downstream Flow

Divergent wind Upper-level PV contour

Precipitation/diabatic heating

Circular outflow pattern Linear outflow pattern

Ridge amplification

Cyclonic wave

breaking

Wind speed max

Blocking onset

Jet elongation

Rossby wave dispersion

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9

9

9

Trough axis

Downstream cyclone9

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Recurving tropical cyclone

Ridge axis

Harr and Archambault (2013).


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2) Tropical cyclone outflow intensifies jet

3) Cyclones form in exit region of intensified jet

COLD

4) High-latitude ridge amplifies

1) Tropical cyclone recurves

Physical Mechanisms that Link Recurving Tropical Cyclones to Blocking

Tropical cyclone outflow characteristics impact the type of midlatitude response:i) Circular outflow pattern and ridge amplificationii) Linear outflow pattern and jet elongationThe midlatitude response impacts the potential for blocking, the longitude of blocking, and the intensity of the block

Harr and Archambault (2013).


Extreme Weather Events:Blocking

Key Research Questions:• What is predictability at 1-6 wks of duration of

blocking and stationary waves from existing global models?

• What is the minimum horizontal and vertical resolution needed for global models to capture blocking events?

• For predicting onset/cessation of stationary wave events, to what extent is it necessary to accurately predict• MJO, stratospheric warming events?• Subtropical jets (existence, persistence)?• Planetary wave breaking (with anticyclonic jets)?

• To what extent are deficiencies in prediction of blocking dependent on model physics suite (deep convection, radiation)?

Sandy landfall

ATL longitude

Tim

e


Seasonal Tropical Cyclone Threat: Predictability ofTropical Cyclone Likelihood, Mean Track, and Intensity

from Weekly to Seasonal Timescales

ESPC Demonstration #2 – Improved pre-season guidance of tropical cyclone seasonal trackand frequency statistics as well as sub-seasonal outlooks for civil and military planning. Objectives:•Prediction of seasonal basin scale tropical cyclone genesis and track distributions and potential intensity. Thrusts:• Initial value, short range prediction improvements for track and structure. • Boundary value, longer range probabilistic forecasts of maximum likelihood genesis, track, intensity.• Landfall probability with the accompanying potential intensity and precipitation to support resource management, evacuation plans, ship routing, etc. Challenges:•Multi-scale convective processes and interaction between tropical cyclone and the large scale environment, and our understanding and ability to predict them vary widely from basin to basin.

Goswami et al. (2003) Maloney and Hartmann (2000)


Key Research Questions:• Madden Julian Oscillation (MJO) is the most prominent signal of the intra-

seasonal oscillations• TC genesis is correlated with the positive (convective) phase of MJO• Phase of MJO influences the intensity of TCs• El Nino and Southern Oscillation (ENSO) is the most prominent signal of

interannual variability• SST variations

• ENSO impacts TC activitiesWhat is the predictability of these phenomena?

Tropical cyclone activities are closely linked to seasonal, intraseasonal oscillations, and ENSO

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Seasonal Tropical Cyclone Threat: Predictability ofTropical Cyclone Likelihood, Mean Track, and Intensity

from Weekly to Seasonal Timescales


Tropical Cyclone Demonstration Phase I

I. Seasonal Tropical Cyclone Approach• Leverage advanced model predictions on seasonal to inter-

annual timescales for improved seasonal tropical cyclone predictions

• Interannual variability (El Nino and La Nina) affects TC activity, formation locations, track type, and intensity in all basins, but especially in the Atlantic

• Dynamical seasonal TC forecasts have been shown to be as skillful as statistical techniques (Camargo et al. 2007)

• Tropical cyclone activity and maximum intensity distribution have been used as metrics demonstrating viability of advanced climate models such as GFDL High-resolution Atmospheric Model (HIRAM)


Tropical Cyclone Demonstration Phase I

II. Extended-range (5-30 day) approach• Recent research has advanced understanding, predictive

capability of intraseasonal variability (e.g. MJO), and modulation of intraseasonally-varying large-scale circulation on tropical cyclone formation, tracks

• Active phase of MJO is favorable for TC formation in conjunction with monsoon circulation (e.g., western North Pacific)

• TC motion is primarily determined by large-scale steering flow; intensification to typhoon intensity requires favorable environmental conditions over a large area, so TC tracks TCs are also modulated on intraseasonal timescales

ECMWF 32-day ensemble has been demonstrated to predict MJO variability on 20 day timescales


Tropical Cyclone Phase II Predictive Capability (2018-2025)

Seamless Tropical Cyclone Prediction (1 day to seasonal)

• Focus in Phase II: fill the subseasonal gap between the extended-range (5-30 day) and seasonal time scales

• Utilize advanced seasonal tropical cyclone prediction models in the subseasonal time range

• Extend the integrations of multiple skillful extended-range models into subseasonal time range

• ECMWF is already considering a 45-day ensemble


High Impact Weather 0-100 Day Pilot Project (HIWPP)

• Vision– Improve prediction of high-impact weather events in the 0 to 100 day

range: extreme events– Produce regular research-reliable runs from multi-agency models– Unify physics, scale-aware parameterizations, statistical and other post-

processing– Implement common modeling standards across local enabling

technologies (ESMF, NUOPC Interoperability Layer, nesting, unstructured grids; dynamical core, other numerics)

– Use common skill metrics, diagnostics and prognostics • A response to:

– Perceived recent increase in frequency/character of extreme weather– Increased national assets/infrastructure at risk

• Hurricane Sandy supplemental funds available to develop some of these capabilities


High Impact Weather 0-100 Day Pilot Project: Improved Computational Efficiency

• Incorporate next-generation Global Atmospheric Cloud Resolving Models (GCRM) – and Air-Wave-Ocean Coupled Models across scales.

•GFS/CFSv2, NMMB, FIM/iHYCOM, FMS/MOM, HiRAM, MPAS, NUMA, NAVGEM/HYCOM, MPAS, CESM etc.

• High resolution for regional high impact and extreme events• Adaptive/unstructured mesh is less dispersive and allows for better

scaling/computational efficiency• Potentially improved prediction at weather to short term seasonal climate

variability scales (5-100 days)


High Impact Weather 0-100 Day Pilot Project (HIWPP)

0-100 Day Pilot ProjectBlocking

Tropical Cyclones

Arctic

HABs/Hypoxia

AMOC


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Summary

There is an increasing effort to partner on environmental prediction within the Federal agencies as represented by NUOPC and ESPC

ESPC will provide the next generation of operational environmental prediction service to the Nation in order to meet increasing needs for guidance beyond ten days to decades

Through recent workshops, ESPC has been better defined and has proposed five thrusts at ISI timescales in addition to exploring the feasibility of operational decadal prediction

Some ESPC efforts directly support improved TC forecasting at sub-seasonal to seasonal time scales

The ESPC demonstrations are open to wide participation


Discussion


Strategy• Synergy among academia, laboratories, and operation centers• Team members are experts on TCs, intraseasonal to interannual variabilities, and model

developers

• Melinda Peng (NRL)• Suzana Camargo (U C)• Mark DeMaria (NESDIS)• Russ Elsberry (NPS)• Tim Li (U H)• Eric Maloney (CSU)• Shian Jiann Lin (GFDL)• Duane Waliser (JPL)• Stan Benjamin (ESRL)• Bill Skamarock (NCAR)• Jim Dudhia (NCAR)• Rich Neale (NCAR)• Wayne Higgins (CPC)• Jae Schemm (CPC)• Carolyn Reynolds (NRL)• Tim Whitcomb (NRL)

Team members• NOAA Weather and Climate

Forecast System (GFS/CFS)• GFDL High-resolution

Atmospheric Model (HiRAM)• Navy Global Environment Model

(NAVGEM)• Flow-following finite-volume

Icosahedral Model (FIM)• Non-hydrostatic Unified Model

for Atmosphere (NUMA)• Model for Prediction Across

Scales (MPAS)• Community Earth System Model

(CESM)

ModelsBasic

Research

Model Development

Operational Implementation


ESPC Roadmap2010-2011• Planning, First ESPC scientific workshop (Boulder, CO Sep 2010)

2012-2013 • Interim Scientific Steering Committee formed, ISSC workshop

(Silver Spring, MD, Mar 2012) • Proposed demonstration systems for IOC at 2018, Demo workshop

(Nov 2012) 2013-2017 • Construct implementation plan for each demonstration project• Develop a better understanding of the bounds on prediction skill at

various time and space scales in the current “skill nadir” • Implement systematic improvements in Research towards

Operations • Conduct verification and validation with common metrics

2018• Initial Operational Capability (IOC) towards a FOC by 2025

Earth System Prediction Capability ESPC 1 Earth System Prediction Capability (ESPC) Daniel P....

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